Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (5.3)	$ (10.0)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	0.5	0.4
Non-cash interest expense related to sale of future royalties	0.4	0.4
Non-cash royalty revenue related to sale of future royalties	(0.1)
Change in operating assets and liabilities:
Accounts receivables	0.5
Prepaid expenses and other current assets	0.4	(1.2)
Accounts payable and accrued expenses	(0.9)	(0.3)
Net cash used in operating activities	(4.5)	(10.7)
Cash flows from investing activities:
Purchases of short and long-term investments	(7.0)
Maturity of short-term investments	13.4	6.9
Net cash provided by investing activities	6.4	6.9
Increase (decrease) in cash and cash equivalents	1.9	(3.8)
Cash and cash equivalents at beginning of period	17.7	49.7
Cash and cash equivalents at end of period	$ 19.6	$ 45.9